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Chemical control of downy mildew of onion


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FACTSHEETS FOR FARMERS
www.plantwise.orgCreated in Pakistan, June 2014
Chemical control of downy mildew of onion
Recognize the problem
Downy mildew is a disease that is caused by a fungus. The fungus cannot be
seen by the naked eye but when the problem is severe, you can see the
symptoms of the disease on the plant leaves. Infected bulbs are usually small
compared to healthy bulbs. The disease causes leaves to turn pale green or
yellow, and...

plantwise.org

Drying tubers to control neck and bulb rot of onion and garlic


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FACTSHEETS FOR FARMERS
www.plantwise.orgCreated in Pakistan, June 2014
Drying Tubers to Control Neck and Bulb Rot of Onion and Garlic
Recognize the problem
Neck and bulb rot of onion and Garlic generally appears during storage but the
infection may also originate in the field. The symptoms begin at the neck of the
onion. The affected tissue softens, becomes water soaked and turns brown.
The infected plants may be stunted with drying outer...

plantwise.org

Intercrop cabbage with onion against aphids


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FACTSHEETS FOR FARMERS
www.plantwise.orgCreated in Zambia, July 2014
Intercrop cabbage with onion against aphids
Recognize the problem
Aphids are very small soft-bodied roundish insects of about 1 to 3 mm in
length. The body colour varies from yellow to green to brown to purple. They
live on most fruits, vegetables and ornamentals. Aphids feed by sucking sap
from the plant. In cabbage, they are found on the leaves where they feed and
cause...

plantwise.org

Using neem seed for managing thrips in onion


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FACTSHEETS FOR FARMERS
www.plantwise.orgCreated in Ethiopia, August 2014
Using neem seed for managing thrips in onion
Recognize the problem
Thrips are very small insects, about the size of a flea and just about visible to
the naked eye. Immature stages referred to as nymphs are either yellow or
white. Older individuals are yellowish-brown and move quickly. They feed by
damaging the surface of the leaves and sucking the sap that exudes from the...

plantwise.org

Seed bulb treatment on onion


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
Sri Lanka
,
October
2013
Seed Bulb Treatment on Onion
Recognize the problem
Many of the fungal diseases affecting onion are seed borne. Preventive actions
are always better than curative actions to minimize economic loss. Therefore,
seed treatment before establishment of the crop is essential.
Background
Seed treatments can often be used to control pathogens that occur on or in the...

plantwise.org

Purple blotch in onions


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
Bolivia
,
July
2012
Purple blotch in onions
Recognize the problem
Purple blotch is one of the diseases that cause most damage to the onion. It
causes deep white spots with a yellow halo and a purple or red centre. In
humid climates, the spot surface becomes dark or coffee-colored. Within 2 to 3
weeks, these spots surround the leaves. In the bulbs, the infection appears
close to...

plantwise.org

Thrips on onion


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Onion thrip control


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
Honduras
,
November
2012
Onion thrip control
Recognize the problem
The thrips develop in the onion as well as in weeds and on the soil. Thrips are
very small, about the size of a grain of sand, and are hidden in the leaf axils of
onion. While feeding, they scrape the leaf surface and leave a free entrance to
fungal diseases. Young adults are transparent white but soon become dark and...

plantwise.org

Thrips management in tomatoes


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
Tanzania
,
October
2012
Thrips management in tomatoes
Recognize the problem
Thrips ("Vithiripi" in Swahili) are very small and thin insect pests (1.5 mm
long). They are light grey-greenish, but difficult to see. Thrips cause tiny scars
on leaves and fruits. Damaged leaves become papery and may curl and drop
prematurely. Thrips usually attack during the flowering stage of tomatoes....

plantwise.org

"Burned tip" or downy mildew in onions


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FACTSHEETS FOR FARMERS www.plantwise.org Created in Honduras , November 2012 "Burned tip" or downy mildew in onions Recognize the problem Downy mildew is a fungus that affects all stages of the onion plant. It produces burns and coffee-colored spots on the leaves, generally starting at the tips and moving downwards. At the beginning, it can be confused with injuries caused by chemicals and mechanical damage. A severe attack may reduce the yields...

plantwise.org

Thrips management in onion


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
Tanzania
,
September
2013
Thrips management in onion
Recognize the problem
Thrips
(“
Vithiripi

in Swahili) are very small, only
1.5
mm long, thin insect pests. They
are light grey-greenish, but very difficult to see.
They suck on onion leaves starting on leaf bases. Leaf surfaces become covered with
silvery feeding leaf spots or patches. You can usually see these along...

plantwise.org

Soap sprays against thrips in onion


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
Tanzania
,
September
2012
Soap sprays against thrips in onion
Recognize the problem
Thrips are very small, only
1.5
mm long, elongate insect pests. They are light
grey-greenish, but difficult to see.
They suck on the leaf bases of onion. Infested onions develop silvery leaf spots
or patches along the inner angles of onion leaves. Infestation causes
premature wilting, delay in...

plantwise.org

Management of uniformity in size of bulbs in onion


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
India
,
November
2012
Management of Uniformity in Size of Bulbs in
Onion
Recognize the problem
Non-uniformity in bulb size of onion is a very big problem which leads to
economic loss to the farmers. Non-uniform bulbs are difficult to store for
marketing. The difference in size does not attract a good value for the crop in
the market. Hence, the uniformity in size of onion bulbs is...

plantwise.org

Tomato spotted wilt virus on tomato


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
Kenya
,
December
2012
Tomato Spotted Wilt Virus on Tomato
Recognize the problem
The tomato fruit shows yellow or pale red ring patches and some areas of the
tomato may die. Purplish-brown spots appear on young leaves. Older leaves
turn brown and drop. The whole plant becomes stunted and wilted. The tip of
leaves may dieback and leaves may cup downwards.
Background
This virus is...

plantwise.org

Bugs on mango


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
Kenya
,
December
2012
Bugs on Mango
Recognize the problem
The most common bugs found in mango orchards include the Helopeltis bugs
also called mosquito bugs, Tip wilters and the Coconut bug. Both young and
adult bugs feed on young flesh on the mid-vein of young leaves, or on flower
stalks, causing wilting and death of new growth. They also feed on young fruits
causing immature...

plantwise.org

Aphids on Brassica


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FACTSHEETS FOR FARMERS
www.plantwise.org
Created in
Kenya
,
December
2012
Aphids on Brassica
Recognize the problem
Cabbage aphids are green to pale grey insects with a white, waxy coating.
They are soft-bodied insects found in groups, often underneath the leaves.
They cause misshapen leaves, spread virus diseases and produce a sugary
substance called honeydew. This substance sticks on the leaves and
encourages a black fungal growth....

plantwise.org

Pest and Disease Photoguide to Onion disorders


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KNOWLEDGE FOR LIFE
Onion disorders
CABI PEST AND DISEASE PHOTOGUIDE TOIntroduction
This photo booklet has been produced
by the CABI-led Plantwise programme
(www.plantwise.org) to aid extension officers
and other plant health advisors in diagnosing
the most common pests, diseases and
abiotic problems of coffee around the world.
The symptoms presented on a real plant
sample can be compared with the photos
in this guide to identify possible causes...

plantwise.org

Knapsack spraying onions


Chaudhary


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The Journal of Animal & Plant Sciences 19(4): 2009, Pages: 202-204
ISSN: 1018-7081
EFFICACY OF DIFFERENT FUNGICIDES FOR THE CONTROL OF DOWNY MILDEW
OF CUCUMBER
S. U. Chaudhry, J. Iqbal and A. Mustafa*
Adaptive Research Farm Gujranwala
*Department of Plant Pathology, University of Agriculture Faisalabad
ABSTRACT
A field experiment was conducted to evaluate the performance of different fungicides against downy mildew on
cucumber (Cucumis...

thejaps.org.pk

pp0124


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Plant Pathology Fact SheetPP-124Florida Cooperative Extension Service/ Institute of Food and Agricultural Sciences/ University of Florida/ Christine Waddill, Dean Botrytis Leaf Blight and Purple Blotch of
Onions in Florida
Tom Kucharek, Extension Plant Pathologist, Plant Pathology Department, Uni-
versity of Florida, Gainesville FL 32611.1996, Revised January 2000.
Onions are grown throughout Florida in
small-to medium-sized commercial...

plantpath.ifas.ufl.edu

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